EP1089506A2 - Vorrichtung und Verfahren zur integrierten Telekommunikation - Google Patents

Vorrichtung und Verfahren zur integrierten Telekommunikation Download PDF

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Publication number
EP1089506A2
EP1089506A2 EP00308385A EP00308385A EP1089506A2 EP 1089506 A2 EP1089506 A2 EP 1089506A2 EP 00308385 A EP00308385 A EP 00308385A EP 00308385 A EP00308385 A EP 00308385A EP 1089506 A2 EP1089506 A2 EP 1089506A2
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Prior art keywords
layer
bandwidth
network element
cap
switched
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Withdrawn
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EP00308385A
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English (en)
French (fr)
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EP1089506A3 (de
Inventor
Yang Cao
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Nokia of America Corp
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Lucent Technologies Inc
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Publication of EP1089506A2 publication Critical patent/EP1089506A2/de
Publication of EP1089506A3 publication Critical patent/EP1089506A3/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2491—Mapping quality of service [QoS] requirements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0064—Admission Control
    • H04J2203/0066—Signalling, e.g. protocols, reference model
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0064—Admission Control
    • H04J2203/0067—Resource management and allocation
    • H04J2203/0069—Channel allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols
    • H04J2203/0083—Support of the IP protocol
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H04L2012/5632—Bandwidth allocation
    • H04L2012/5634—In-call negotiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5665—Interaction of ATM with other protocols
    • H04L2012/5667—IP over ATM

Definitions

  • the invention relates to telecommunications systems and, more particularly, to the integration of circuit switched and packet switched telecommunications services.
  • IP internet protocol
  • Telecommunications links may be established in a number of ways, with different advantages accruing to different methods of connection.
  • Circuit switching is a technique which yields highly reliable service and is particularly suitable for such "real time" communications applications as voice, in which the momentary loss of a channel is annoying, and repeated such losses are unacceptable. Circuit switching is also employed for highly reliable leased-line services.
  • Electronic switching systems, such as the 5ESS may interconnect a multitude of telephone instruments through circuit switching, employing time division multiplexing (TDM), for example.
  • TDM time division multiplexing
  • the switches In order to ensure that end-users receive the appropriate quality of service, the switches typically monitor and periodically test the activity of the trunk lines that carry the channels being switched. If a communications error occurs, the switch may employ a "loopback" to isolate, or determine the exact location of, the system component that caused the error. Once the failure is isolated , the system may reconfigure itself so that data may be routed around the failed system component, through a loopback, or take other corrective measures. TDM transport networks provide an assured level of performance and reliability.
  • Synchronous Optical Network/Synchronous Digital Hierarchy may be employed in the transport infrastructure to provide high-capacity transport, scalable to gigabit per second rates, with excellent jitter, wander, and error performance for voice connections and leased-line applications.
  • SONET/SDH self-healing rings enable service-level recovery within tens of milliseconds following network failures.
  • Packet switching may be employed to maximize the utilization of telecommunications links, such as leased circuit-switched lines.
  • telecommunications links such as leased circuit-switched lines.
  • the links are statistically mutliplexed to achieve maximum link utilization and are typically carried on leased circuits through the TDM transport network.
  • Packet-switched systems often employ Internet Protocol (IP) transport methods to route packets from a source to a destination.
  • IP Internet Protocol
  • Such systems generally employ "best-effort" techniques to deliver the packets and they generally lack the means to guarantee high reliability and predictable performance. Although statistical multiplexing yields high link utilization, the best-effort service provided by IP data networks is accompanied by unpredictable delay, jitter, and packet loss.
  • IP data networks provide excellent connectivity, they do not enable controllable distribution of network resources among the various service providers employing the IP data network to provide data transmission services to end users. That is, through a provisioning process that typically requires the intervention of craft workers, a process that takes place relatively infrequently, the TDM-based transport services provide fixed bandwidth communications channels for each service provider. Since packet data traffic is inherently irregular, with bursts of heavy utilization followed by periods of relative inactivity, the fixed bandwidth "pipes" of TDM transport limit the flexibility with which transport users, such as IP data transport service providers, can respond to variation in demand from their end-users. Service providers must rely upon the good behavior of end users, who must scale back their transmissions during periods of heavy congestion.
  • transport management is segregated into separate operation and maintenance functions.
  • this segregation of operations and maintenance functions generally requires the coordination of separate organizations and renders the process of end-to-end provisioning of a channel a difficult task.
  • provisioning requires an inordinate amount of expertise and time, complicates the task of traffic engineering, and, as a result, the quality of service suffers while, at the same time, the transport core is underutilized.
  • a system and method which provide network infrastructure support to provide differentiated service guarantees and corresponding service level agreements to service providers, while taking advantage of both the high quality of service provided by circuit switched systems and the high utilization afforded by packet switched systems, would be highly desirable. Additionally, it would be highly desirable for such a system to dramatically increase, and maximally share, backbone network infrastructure capacity, and provide sophisticated service differentiation for emerging data applications, at least in part by dynamically managing the transport core bandwidth.
  • a telecommunications system in accordance with the principles of the present invention includes a convergence protocol that provides efficient inter-layer communications between nodes within the network.
  • the convergence protocol permits the transport layer of one network node to communicate directly with the service layer of another network node.
  • the service layer is configured as an internet protocol (IP) layer, which may employ asynchronous transfer mode switching
  • the transport layer is a SONET transport layer.
  • IP internet protocol
  • Each of the nodes may be a telecommunications element such as an add-drop-multiplexers (ADM) or a digital cross connect, for example. This inter-layer communication is achieved through a layer-1 pass through operation.
  • ADM add-drop-multiplexers
  • SONET bandwidth provisioning which heretofore has been static, is rendered flexible. Additionally, the division between transport and service is eliminated. This increased flexibility, in turn, provides support for differentiated service guarantees and corresponding service level agreements.
  • the system provides the high quality of service typical of circuit switched systems, and, at the same time, features the high utilization of a packet switched system.
  • a system in accordance with the principles of the present invention merges IP transport and SONET/SDH transport through a novel convergence protocol. The flexibility provided by this approach permits dynamic management of a link's internal transport bandwidth thereby accommodating bursty traffic at minimal cost, with little end-to-end latency.
  • each tributary is fixed for extended periods, often months.
  • the termination point of a tributary may be dynamically altered to accommodate a service provider's run-time needs. Consequently, the potential re-configuration period may be reduced from months to minutes, or even seconds.
  • a communications network employs a protocol hereinafter referred to as the convergence protocol, which encapsulates the SONET/SDH transport details and which permits internal bandwidth to be managed on the fly to accommodate varying service demands.
  • the convergence protocol encapsulates the SONET/SDH transport details and which permits internal bandwidth to be managed on the fly to accommodate varying service demands.
  • the SONET/SDH transport backbone may adaptively rearrange its internal bandwidth thus permitting automated end-to-end provisioning.
  • One or more network elements are configured as core access points (CAPs) to provide an interface between SONET/SDH transport and external IP transport.
  • CAPs core access points
  • a telecommunications system 100 including both packet switched and circuit switched components operates in accordance with the principles of the present invention.
  • one or more SONET/SDH network elements (NE1, NE2, and NE3 in this illustrative embodiment) provide the circuit-switched cross connect for packet switched devices such as internet protocol (IP) device 104, asynchronous transfer mode (ATM) device 106, and and ATM device 108.
  • IP internet protocol
  • ATM asynchronous transfer mode
  • ATM device 108 may be a combination of one or more devices that could be arranged in a ring topology for example.
  • the system 100 is shown with only a limited number of devices in order to simplify the exposition and understanding of the invention.
  • Two cross-connect paths, 110 and 112 between the IP device 104 and ATM device 106 and between the IP device 104 and the ATM device 108, respectively, provide the specific circuit switched paths across the SONET/SDH transport layer.
  • Each path may transit a plurality of SONET/SDH network elements and may share the bandwidth through each of those elements with other paths not shown in Figure 1.
  • a service provider may provision a portion of the bandwidth on each of the paths 110 and 112 for use by customers who wish to transmit data between the IP device 104 and the ATM device 106 and between the IP device 104 and the ATM device 108, for example.
  • OSI layers which are known and discussed, for example, by Ming-Chwan Chow, "Understanding SONET/SDH” ANDAN Publisher, Holmdel, NJ pages 2-31 through 2-32, which is hereby incorporated by reference.
  • a telecommunications system in accordance with the present invention may perform inter-layer communications between network elements. That is, the service layer of a network element such as NE1 may communicate with the transport layer of network element NE2. As will be described in greater derail below, this communications path permits a network in accordance with the principles of the present invention to re-provision the paths 110 and 112 to accommodate changing bandwidth demand along the paths.
  • the network element NE1 may directly request of the network element NE3 sufficient bandwidth to supply data to NE2 along paths 112 and 113 from NE1 to NE2.
  • This immediate provisioning is accomplished through a direct inter-layer and inter-element communications in the direct communications channel (DCC) as described in greater detail below.
  • DCC direct communications channel
  • Each of the network elements NE1, NE2, and NE3, of Figure 1 could operate as a CAP, thereby permitting SONET transport for packet-switched networks such as those which employ Internet Protocol.
  • a front-end aggregating router may be consolidated with an entry CAP, so packet level traffic may be served by an entry CAP.
  • each CAP has the capability to monitor both layer-3 and layer-1 operations, each CAP also has the ability to re-arrange the size of individual logical-pipes "on the fly" (through exchanging Convergence Protocol message with other nodes). Consequently, the inventive system can adaptively adjust the bandwidth to optimize pipe-utilization, and, at the same time, improve service for best effort delivery traffic based on each CAP's performance monitoring. It may also adjust the bandwidth arrangement based on input from a centralized network management system which collects the global network traffic statistics.
  • the conceptual block diagram of Figure 2 illustrates the interconnections between the packet-switched 202 and circuit switched 204 components of a network element 200 in accordance with the principles of the present invention.
  • the packet-switched component 202 includes an internet protocol and asynchronous transfer mode switch 206 that is operatively connected to line cards 208 and 210.
  • the line cards 208 and 210 are connected through SONET links 212 to the circuit switched section 204 through the circuit switched Input/output 214 of a circuit switched shelf 216.
  • the circuit switched section 202 may include a plurality of local switch fabrics, or circuit switched shelves, such as fabrics 216. 218 and 220.
  • Each of the fabrics may include I/O, such as I/O 214 and 216 of the fabric 216, a local switch core 222, shelf control 224, and an interface 226.
  • the interface 226 provides communications between the local switch fabric and a central switch fabric 228.
  • the central switch fabric 228 includes shelf control 230, an interface 232 for each of the local fabrics, and a central switch core 234.
  • a network element such as the network element 200 of Figure 2 may be employed as an interface between circuits switched and packet switched networks.
  • the network 300 illustrated in the conceptual block diagram of Figure 3 includes core access points 302 and 304 which provide an interface between the IP transmissions of elements 306 and 308 and the SONET transport of elements 310, 312, 314, and 316. That is, transmissions among the network elements 310, 312, 314, 316, 302, and 304 are SONET/SDH transport transmissions, and transmissions among network elements 302, 304, 306, 307, and 308 are IP transmissions.
  • the convergence protocol encapsulates the OSI stack.
  • the convergence protocol data unit format is illustrated in Figure 4.
  • the data unit comprises a five byte header and variable length fields.
  • the header includes a one-byte convergence protocol discriminator, a one-byte length indicator, one byte that is split between length indication and version number, a one-byte protocol data unit type indicator, and a checksum.
  • Each protocol stack has its own layer structure. For example, in OSI there are seven layers: Physical, Link, Network, Transport, Session, Presentation, and Application.
  • the new protocol is positioned at the Application layer and the length indicator indicates the total length of the associated protocol data unit (PDU), in bytes. This number may not exceed 4K in this illustrative embodiment.
  • the PDU type indicator may be used to denote any one of 256 PDU types, each of which has its own format associated with it.
  • the checksum byte is stores the checksum for the PDU.
  • the PDU may be any of 256 types, including:
  • the corresponding Variable Length Fields includes the following header message:
  • the corresponding Variable Length Fields includes the following header message:
  • the Label Withdraw, Label Release and Label Notification messages used in LDP may be used for CRLDP directly.
  • each CAP node has been provisioned with network service access point (NSAP) address and IP address
  • the CAP node runs both OSI stack and TCP/IP stack.
  • each core intermediate point (CIP) node a SONET/SDH network element that is strictly digital cross-connect system (DCS) and serves as part of SONET/SDH transport
  • NSAP network service access point
  • CIP core intermediate point
  • Level 2 IS-IS supported, multiple-area based infrastructure is supported and the full 20-byte NSAP is used.
  • Any variety of physical network topology such as single-ring, ring-based mesh inter-connection, mesh based topology, etc., may be employed with the new, convergence, protocol.
  • the topology of this virtual autonomous system may be auto-discovered by establishing the IS-IS adjacency relationship based on an exchange of IS-IS HELLO message, then, establishing the physical topology of each node, including CAP and CIP, based on the exchange of IS-IS Link State PDU (LSP).
  • LSP IS-IS Link State PDU
  • Each CAP node serves as gateway for this virtual autonomous system.
  • Each CAP establishes neighbor relationships with external routing neighbors through either an interior gateway protocol (IGP) or exterior gateway protocol (EGP) routing message. After establishing neighbor relationships, the CAP then obtains external route reachability information through a routing update message.
  • IGP interior gateway protocol
  • EGP exterior gateway protocol
  • Each CAP pair establishes an internal logical path. That is, although there may be one or more intermediate nodes between CAPs each CAP establishes the logical path to the other CAP by discovering the other CAP's node address. To establish the logical path, IS-IS communication is enhanced as follows.
  • IS-IS communication is described in, "Intermediate System To Intermediate System Intra-domain Routing Exchange Protocol For Use In Conjunction With The Protocol For Providing The Connectionless-mode Network Service (ISO8473)", ISO DP 10589, which is hereby incorporated by reference in its entirety.
  • Conventional IS-IS Level 2 LSP exhibits the format illustrated in Figure 5.
  • Figure 5 the format of Figure 5 is employed, thereby maintaining compatibility with the existing IS-IS stack.
  • the Variable Length Fields are expanded so that each CAP can flood its IP address information to the other CAPs based on IS-IS LSP update.
  • the IS-IS level 2 LSP Variable Length Field format is illustrated in the diagram of Figure 6, in which one byte describes the code, one byte describes the length of the field and the remainder, the value.
  • CODE 15 and CODE 16 are used to support IP-V4 and IP-V6 address announcement, as illustrated in the enhanced IS-IS level 2 LSP variable length field diagram of Figure 7.
  • CODE 15 is used to advertise IP-V4 address
  • CODE 16 is used to advertise IP-V6 address.
  • each CAP will advertise its management IP address (either IP-V4 or IP-V6) based on enhanced IS-IS LSP, and each CIP will ignore the enhanced IS-IS LSP field.
  • a CIP In response to the reception of an enhanced IS-IS LSP a CIP will process the PDU conventionally; a CAP will additionally refresh its routing table, based on the incoming information, If the incoming data includes a new IP address, the CAP adds a new entry to its address binding table, as indicated in the binding table diagram of Figure 8. If the new addressed received by a CAP is the address of another CAP, the process, in which the assumption is that each CAP will only advertise its IP management address to another CAP, proceeds as follows:
  • each CAP not only establishes its own address binding table, but also obtains the path information to reach the other CAPs.
  • statically-provisioned internet channels are used to satisfy bursty-traffic through a dynamic bandwidth management mechanism.
  • the dynamic bandwidth management mechanism includes resource management structures, such as a new header table and status table, and processes that a CAP may use to respond to various bandwidth requests.
  • the mechanisms and processes used to provide dynamic bandwidth management will be discussed in greater detail in relation to Figures 10 and 11.
  • resource table For both CAP and CIP nodes, there is resource table associated with each link in case one physical link is associated with one wavelength. In case WDM is deployed, there is resource table entry associated with each ⁇ .
  • the attribute of this resource table includes the address information of its neighbor, and the physical status of each of its STS-1 tributaries, here assuming the SONET network element is equipped with STS-1 level cross-connect capacity.
  • the header information for each node is organized as a table, as illustrated in Figure 10, and each entry in this table is associated with one link or associated with one wavelength.
  • the format for each entry is illustrated in Figure 10.
  • NSAP address field is provisioned as the neighbor's NSAP address
  • the Available Bandwidth field is provisioned as the physical capacity of this link/wavelength, or the number of STS-1 it can support.
  • STS-1 Array Pointer is initialized at run-time which points to the physical starting address of corresponding STS-1 array associated with this header table entry.
  • a Convergence Protocol based transport network in accordance with the principles of the present invention may employ equipment is compatible with and existing SONET equipment. Consequently, the existing SONET restoration approach such as UPSR and BLSR can be directly applied. Additionally, with a routing/LSR function in each CAP, the latest MPLS based restoration approach may also be used if an end-user prefers protection granularity at IP flow level instead of SONET path/line level. So in general, the new transport network architecture offers a variety of protection switching solutions.
  • STS-1 Status Table entry is illustrated in the diagram of Figure 11, in which "Free Status" indicates whether this STS-1 slot has been allocated, the destination NSAP Address indicates what's the corresponding destination address for this tributary, and Available Bandwidth indicates the available bandwidth inside this STS-1 slot.
  • each CAP may receive various formats of Bandwidth Request, which may come explicitly from service provider through SNMP command, or implicitly from MPLS label switching path setup process. These requests may be classified into two different categories: bandwidth allocation and bandwidth de-allocation. Associated with each request, information including IP Destination Address and bandwidth is provided. In response, a CAP in accordance with the principles of the present invention may allocate or de-allocate bandwidth as described below. Either of the described processes may be used to serve as an explicit SNMP provisioning command Additionally, either process may be used to support dynamic allocation. The dynamic allocation may be used to support applications such as MPLS explicit routing, for example.
  • PROCESS 3 STS-1 level bandwidth de-allocation:
  • each CAP node should also support Label Distribution Protocol (LDP), as described in, L.
  • LDP Label Distribution Protocol
  • each CAP acts as a Label Switching Router (LSR). If one assumes that the CAP is positioned as core (or intermediate) LSR, the responsibility of edge LSR converts the conventional IP header into a label and initiates the LDP Path setup message.
  • LSR Label Switching Router
  • a CRLDP message is used to explicitly setup a Label Switching Path. Based on information advertised by each CAP, an external router will have clear topology information about this virtual autonomous system. Consequently, the external router is capable of setting a path traversing this virtual autonomous system.
  • a system in accordance with the principles of the present invention sends traffic contract associated with the corresponding IP flow along the explicit path.
  • each node along the path can decide in advance whether it can support or deny the traffic contract request.
  • an external core router receives the IP flow's traffic request, core router forwards this request to an adjacent CAP, denoting it as A,if next node, as indicated in the explicit path, is an adjacent CAP.
  • Node A then generates the equivalent bandwidth needed to reach next CAP, based on the given traffic contract and the Connection Admission Control mechanism.
  • Node A looks up its resource table to determine whether existing ports can satisfy this request or not. If Yes, Node A reserves the bandwidth and forwards the request to next node. On the other hand, if Node A's existing ports cannot satisfy the request, Node A calculates the closest No. of STS-1 needed to setup a new port to satisfy this request, then determines the internal path (tributary) based on:
  • a system in accordance with the principles of the present invention sets up the LSP for the incoming IP flow traversing transport core. After establishing the LSP, the data flow is as follows.
  • a bandwidth-on-demand SONET/SDH transport infrastructure may be effected using the new convergence protocol as set forth below.
  • a network management system triggers bandwidth allocation. During the path-setup period, it sends the following information to the initiating node (only): the destination address and required bandwidth. Then Convergence Protocol is used to exchange bandwidth information among nodes along the path. Processes 2 and 3, as described above, can be used to support this approach.
  • each CAP node has the up-to-date transport network topology and each CAP collects the performance monitoring information. Based on the above information, it makes a decision by itself as to whether a link's bandwidth should be adjusted.
  • Each CAP also establishes the path based on routing table-lookup; makes the decision to re-adjust the bandwidth for each established tributary based on performance monitoring, and exchanges the bandwidth allocation/de-allocation information with other nodes along the path through Convergence Protocol Processes 2 and 3, as described above.
  • the system 1200 includes a network management system 1202, first and second users 1204 and 1206 that are respectively connected to ATM/IP networks 1208 and 1210. Routers R1 through R4 connect users 1204 and 1206 through the ATM/IP networks 1208 and 1210 to CAPs 1212 and 1214, respectively, which provide access to the transport facilities of the SONET/SDH system 1216.
  • network employs protocol-driven resource management.
  • a bandwidth reservation protocol such as CRLDP or RSVP etc. may be used to trigger bandwidth allocation.
  • these protocols embody implicit bandwidth requirement (to support the corresponding QoS) and explicit path information.
  • the entry CAP node Based on a Connection Admission Control algorithm, the entry CAP node will convert the implicit bandwidth requirement into equivalent bandwidth, then exchange bandwidth allocation/de-allocation information with other nodes along the path as indicated in the incoming protocol message.
  • step 1400 the process begins and proceeds to step 1402 where nodes employing the convergence protocol are initialized.
  • the initialization includes the running of both OSI stack and TCP/IP stack in CAPs and the running of OSI stack in CIPs.
  • step 1404 network nodes follow a process of auto-discovery as previously described in greater detail in the above section entitled, "IS-IS based topology auto-discovery".
  • each CAP pair establishes a logical path between themselves.
  • This logical path establishment may entail the flooding of a CAP's IP address information to other CAPs employing a label switched path variable length field.
  • the logical path establishment process is described in greater detail in the above section entitled "CAP path establishment”.
  • step 1408 a receiving node responds to the reception of a IS-IS label switched path message in accordance with the principles of the present invention by treating it in a conventional manner if the receiving node is a CIP.
  • a CAP will, additionally, refresh its routing table, based on the incoming information. This process is discussed in greater detail in relation to Figure 7.
  • step 1410 a CAP establishes an address binding table and obtains the path information necessary to reach other CAPs. This process is discussed in greater detail in relation to "Process 1", described above.
  • step 1412 a node passes a convergence protocol bandwidth allocation message node to node until it reaches the destination CAP.
  • step 1414 the bandwidth along the path is allocated, if available.
  • the processes of steps 1412 and 1414 are described in greater detail in the discussion of "Process 2", described above. At some point there may be a need for bandwidth de-allocation and, in that case, the process would proceed to step 1416 where a node passes a convergence protocol bandwidth de-allocation message, node to node, until the destination CAP is reached.
  • step 1418 the bandwidth is de-allocated, as appropriate.
  • the processes of steps 1416 and 1418 are described in greater detail in the discussion of "Process 3", described above.
  • the overall process may proceed to END in step 1420, for example, during maintenance or installation operations, for example.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)
  • Time-Division Multiplex Systems (AREA)
EP00308385A 1999-10-01 2000-09-25 Vorrichtung und Verfahren zur integrierten Telekommunikation Withdrawn EP1089506A3 (de)

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US41178199A 1999-10-01 1999-10-01
US411781 1999-10-01

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EP1089506A3 EP1089506A3 (de) 2002-04-24

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JP3522252B2 (ja) 2000-12-04 2004-04-26 アカラ コーポレーション 光回線データを広域／都市域リンクに伝送するためのフレキシブルなマルチプレクサ／デマルチプレクサ及び方法
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US8433819B2 (en) 2007-10-17 2013-04-30 Dispersive Networks Inc. Facilitating download of requested data from server utilizing virtual network connections between client devices
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US9241025B2 (en) 2007-10-17 2016-01-19 Dispersive Networks Inc. Network communications of applications running on devices utilizing virtual network connections with asymmetrical network paths
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US8941659B1 (en) 2011-01-28 2015-01-27 Rescon Ltd Medical symptoms tracking apparatus, methods and systems

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